Potential head windsTesla misses: Tesla fell about seven per cent in the premarket after the electric vehicle-maker’s third-quarter profit, sales and margins missed expectations that were already low. CEO Elon Musk sounded cautious on the conference call. We’ll hear from Tom Narayan, global auto analyst at RBC Capital Markets at 10:20 a.m. EDT. Reuters says Tesla has joined General Motors and Ford in expressing caution about expanding electric vehicle production capacity amid economic uncertainties.